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stk202057s


stk202057s

Editorial image: This image is usable for editorial purposes only!

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Format  Dimensions  Price
XS 640x800 5,00
S 960x1200 10,00
M 1240x1550 20,00
L 1750x2188 40,00
XL 2485x3106 70,00
XXL 3432x4290 100,00
Original 3720x4650 150,00




Description

Using infrared images from the Spitzer Space Telescope, scientists have discovered that the Milky Way's elegant spiral structure is dominated by just two arms wrapping off the ends of a central bar of stars. Previously, our galaxy was thought to possess four major arms. This annotated artist's concept illustrates the new view of the Milky Way. The galaxy's two major arms (Scutum-Centaurus and Perseus) can be seen attached to the ends of a thick central bar, while the two now-demoted minor arms (Norma and Sagittarius) are less distinct and located between the major arms. The major arms consist of the highest densities of both young and old stars; the minor arms are primarily filled with gas and pockets of star-forming activity. The artist's concept also includes a new spiral arm, called the Far-3 kiloparsec arm, discovered via a radio-telescope survey of gas in the Milky Way. Our sun lies near a small, partial arm called the Orion Arm, or Orion Spur, located between the Sagittarius and Perseus arms.This arm is shorter than the two major arms and lies along the bar of the galaxy.

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